Sewing-machine.



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ARTHUR J. BRIGGS, OF SYRACUSE,-NEW YORK, ASSIG'NOR TO THE VANNETTEBOBBINLESS SEWING- IVIACHINE COMPANY, OF AMSTERDAM, NEW YORK, A

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. Specification of Letters Patent.

Patented July 20, 1915.

Ap lication filed Octoher 17, 1913. Serial No. 795,668.

To all whom it may concern:

Be it known that I, ARTH R J. Bxrecs, citizen of the United States,andresident of Syracuse, in the county of Onondaga and State of NewYork,.have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specification. I

My invention relates to sewing machines and has more special referenceto improvements in the operating mechanism of sewing machines of thecharacter disclosed in Letters Patent #875,? 51, issued Jan. 7 1908, inwhich the lever connection between the upper and lower driving shafts,which is arranged within the hollow vertical arm of the machine frame,has a movable fulcrum controlled in its movement by pivoted con nectinglinks. These links, in the machine of the aforesaid patent, were pivotedon fixed studs within the machine arm, and because of theinaccessibility of the parts in such location considerable difficulty,with attendant loss of time and expense, was ex perienced in theassembling of the parts.

To avoid such difficulty has been the main object of my presentinvention and this I accomplish by providing an auxiliary frame forsupporting the fulcrum links within the machine arm which is designedfor detachable connection to the main frame at an easily accessiblepoint'exterior of said arm.

In this way the lever, its fulcrum connections and the auxiliary framemay be assembled as a complete unit separate from the machine frame andthen be secured in position by the attachment of the auxiliary frame tothe main frame.

Referring now to the accompanying drawings in which I have shown only somuch of a sewing machine as is necessary to illustrate my invention,Figure 1 is a vertical section through the arm of a sewing machineembodying my invention, showing in elevation the lever connectionbetween the upper and lower shafts, its fulcrum connections,

' I and the auxiliary frame supporting said fulframe in suitablebearings are the upper and lower driving shafts 6, and 16. The lower orsecondary driving shaft 16 is operated from the upper or primary drivingshaft 6 through the medium of a lever or pitman 7 5 which at its upperend connects with a crank 76 in the shaft 6 and at its lower end carriesa stud 77 engaging a block 78 slidably supported in a grooved crank-arm79 on the shaft 16. At a point centrally between its ends the lever 7 5is also connected with a fulcrum bar 80 by means of a stud 81 on onepart entering a corresponding seat or opening in the other and whichsaid fulcrum bar 80 at its opposite ends and at points equi-distant fromits center fulcrum is pivotally connected with two links 83, 83, whichare respectively pivoted on fixed studs, 84:, 8 1, located at oppositesides of the lever 75. These several parts in so far as described aresubstantially the same in construction and operation as thecorrespondingly indicated parts in the aforesaid patent. In accordancewith my present invention, however, and for the purpose hereinbeforereferred to, the link supporting pivots or studs 84: are carried by anauxiliary frame 85 detachably connected to the main frame at a pointexterior of its hollow arm, this auxiliary frame being designed forlocation within said arm as shown and having at its lower endlaterally-projecting ears or extensions 86 for engagement with the loweredge of the arm to which they are secured by suitable fastening means,such as the screws 87. I

What I claim is 1. In a sewing machine, the combination with the mainframe thereof comprising the usual bed-plate and a bracket arm thereonhaving a hollow vertical portion, and upper and lower shafts supportedby said frame, of a connecting lever between said shafts located inthehollow vertical portion of the frame, a fulcrum for said lever,pivotal links connecting with and controlling the position of saidfulcrum, and an auxiliary frame supporting said links and being detachably connected to the main frame, said auxiliary frame and the leverwith its fulcrum connections being associated as a complete unit forattachment to and detachment from the main frame.

2. In a sewing machine, the combination With the frame thereofcomprising the usual bed-plate and a bracket arm thereon having a hollowvertical portion, and upper and lower shafts supported by said frame, ofa connecting lever between said shafts located inthe hollow verticalportion of the frame, a fulcrum for said lever, pivotal linksconnecting'with and controlling the position of said fulcrum, and anauxiliary frame c0mprising a vertically ranging part extending into saldhollo-W portion of the mam frame for supporting said fulcrum links andat its Qopie's of this patent may be obtained for unit for attachment toand detachment from the main frame.

Signed at Syracuse, in the county of Onondaga, and State of New York,this 14th day of October A. D. 1913.

ARTHUR J. BRIGGS.

Witnesses:

' E. S. BoYNToN, G no. C. Pnmon.

Washington, D. G.

